Appendix A
262
Automation PC 3100 User's manual V 1.00
Translation of the original documentation
A.2 Abbreviations
Abbreviation
Stands for
Description
Normally closed
Stands for a normally closed relay contact.
NC
Not connected
Used in pinout descriptions if a terminal or pin is not connected on the module
side.
ND
Not defined
Stands for an undefined value in technical data tables. This may be because the
cable manufacturer has not provided a value for certain technical data.
NO
Normally open
Stands for a normally open relay contact.
TBD
To be defined
Used in technical data tables if there is currently no value for specific technical
data. The value will be supplied later.
MTBF
Mean time between failures
The expected value of the operating time between two consecutive failures.
Table 252: Abbreviations used in this user's manual
StockCheck.com